#!/usr/bin/env bash

for i in {0..255} ; do
	printf "\x1b[48;5;%sm%3d\e[0m " "$i" "$i"
	if (( i == 15 )) || (( i > 15 )) && (( (i-15) % 16 == 0 )); then
		printf "\n";
	fi
done